Abstract
The Transition Radiation Detector (TRD) was designed and built to enhance the capabilities of the ALICE detector at the Large Hadron Collider (LHC). While aimed at providing electron identification and triggering, the TRD also contributes significantly to the track reconstruction and calibration in the central barrel of ALICE. In this paper the design, construction, operation, and performance of this detector are discussed. A pion rejection factor of up to 410 is achieved at a momentum of 1 GeV/c in p–Pb collisions and the resolution at high transverse momentum improves by about 40% when including the TRD information in track reconstruction. The triggering capability is demonstrated both for jet, light nuclei, and electron selection.
Highlights
A Large Ion Collider Experiment (ALICE) [1, 2] is the dedicated heavy-ion experiment at the Large 17 Hadron Collider (LHC) at CERN
– The temperature of the Front-End Electronics (FEE) is monitored at the control and supervisory level and interlocked with the Power Control Units (PCU) to switch off the devices in case of overheating or loss of communication to the Supervisory Control and Data Acquisition (SCADA)
The results demonstrate a resolution of the truncated mean signal of 12% for tracks with signals in all Truncated mean signal
Summary
A Large Ion Collider Experiment (ALICE) [1, 2] is the dedicated heavy-ion experiment at the Large 17 Hadron Collider (LHC) at CERN. The rare probes need to be enhanced with triggers, in order to accumulate the statistics necessary for differential studies The latter requirement concerns probes involving the production of electrons, and rare high transverse momentum probes such as jets (collimated sprays of particles) with and without heavy flavour. The extracted temporal information represents the depth in the drift volume at which the ionisation signal was produced and allows the contributions of the TR photon and the specific ionisation energy loss of the charged particle dE/dx to be separated The former is preferentially absorbed at the entrance of the chamber and the latter distributed uniformly along the track.
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